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Period: to
The Atom
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Energy levels
The atom contains protons, neutrons, and electrons.
Proton= positive charge
Neutron= neutral charge
Electron= negative charge
It was first proposed by early Indian and Greek philosophers. -
Electrons
Discovered by J.J Thomson.
Electrons are negatively charged subatomic particles .
It was discovered by experimenting with Cathode Rays.
The mass of an electron is 9.11 x 10 to the negative 31st power. -
The Nucleus
The Nucleus
The Nucleus was discovered by Ernest Rutherford.
As the Gold Foil experiment was being performed, he disovered it. -
The Proton
The proton, electron, and neutron
The Proton of an atom was discovered by Ernest Rutherford in 1918.
The proton has a positive charge,
the mass the the proton was 1.6 x 10 to the negative 27th power.
The proton was discovered in the nucleus -
The Neutron
The Neutron was discovered by James Chawick in 1932.
it has a neutral charge to it, and the mass is slighty larger then the protons.
It was discovered when James performed a series of experiments. He suggested that the new radiation consisted of uncharged particles of the mass of a proton, he called them neutrons
